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InterviewSolution
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In A Table Can We Use Primary Key In One Column And In Another Column Both Unique And Not Null Constrains.if Yes How? |
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Answer» Yes, you can have a column for Primary key and have another column which will have no DUPLICATES or NULL. e.g. A SALARY Table will have employee ID as primary key. The table ALSO contains TAX-ID which can not be null or DUPLICATE. Yes, you can have a column for Primary key and have another column which will have no duplicates or null. e.g. A Salary Table will have employee ID as primary key. The table also contains TAX-ID which can not be null or duplicate. |
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